- unpack rar-archive
- copy all files to your user folder:
e.a: C:\Users\"Username"\AppData\Local\Autodesk\3dsMax\"2015 - 64bit"\ENU (replace "Username" by your own username and "2015 - 64bit" by your actual 3dsMax version!)
- run merlinScripts_MrCleanLoader.ms to evalutate the macroScript
- got to the "Toolbars" tab under Customize/Customize User Interface
- under "Category" you will find "merlinScripts"
- select/pull the Mr Clean icon into you toolbar
- enjoy